Micrometer depth-gage.



F. A. NELIS.

MICROMETER DEPTH GAGE. APPLICATION FILED DEc.4.1912.

1,266,977-, Patented May 21,1918.

WTE@ STATE@ PATENT FFTQE.

FRANK A. NELIS, OF PIQUA, OHIO.

MICROMETER DEPTH-GAGE.

Application filed December 4, 1917.

To all whom t may concern:

Be it known that I, FRANK A. NELIs, a citizen of the United States, residing in Piqua, in the county of Miami and State of Ohio, have invented a new and useful Micrometer Depth-Gage, of which the following is a specification.

The object of my invention is to provide a novel attachment to be used in connection with an inside micrometer to transform same into a depth instrument. I attain the objects of my invention by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a side elevation, partly in section, of my invention;

Fig. 2 is an edge view of same; and

Fig. 3 is a section online 3-3 of Fig. 1.

Like numerals designate like parts in all the views.

Referring to the accompanying drawings, I provide a suitable base 1, having a channeled shaft 2 in the channeled portion of whichv is mounted a spring 4 which bears against the lower end of an inside micrometer 12. Miorometer 12 is provided with a measuring rod or stem 13, which extends through channel 3 of base 1, as shown in Fig. 1. Extending upward from shaft 2 are suitable arms 5, to the upper ends of which a bar 6 is engaged by screws 7. Mounted on bar 6 I provide a threaded micrometer engaging member 10 having a cupped end 9 shaped to engage the end piece 15 of the micrometer 12, as indicated in Fig. 1. A suitable lock nut 11 adjustably securesl member 10 in the desired adjusted position. I provide one of the arms 5 with a suitable guide 8, as shown in the drawings, and which loosely engages pin 14 carried by the micrometer, to prevent the device from moving out of the desired position.

To attach the attachment to the inside micrometer, first take out one of the screws 7 at the top of the attachment and loosen the other one slightly, so that bar 6 will turn around. Then place coil spring 4 over Specification of Letters Patent.

Serial No. 205,390.

stem 13 of micrometer. Then insert the micrometer in the attachment with stem 13 passing through channel 3 in base l, and with spring 4 resting in the enlarged channeled portion of shaft 2, as shown in Fig. 1, with pin 14 projecting into the guide 8. Guide 8 merely serves to keep the microineter from turning while adjustingmeasurements. Then compress spring 4 by forcing the micrometer 12 downward. Then turn the bar 6 back in place and tighten screws 7. Then allow spring 4 to force micrometer upward until pin 15 enters the cupped member 9. Then adjust the micrometer to zero as shown. down until stem 13 comes flush with bottom of base (after base 1 has been placed on a smooth surface), and lock member 10 with lock nut 11, whereupon the instrument is ready to use as a depth micrometer, thus making new use of the inside micrometer by means of this attachment. Dierent depth holes can be measured by inserting different length stems 13. The device is intended for use in measuring various iron and steel parts where it is necessary to find the depth of a hole.

What I claim is:

In combination with a micrometer an attachment for converting an inside micrometer into a depth measuring instrument,

comprising a base, a channeled shaft eX-' tending upwardly from the base,` a spring mounted in the aforesaid shaft, arms eX- tending upwardly from the shaft, a bar releasably secured to the upper ends of the arms, an adjustable micrometer engaging member mounted on the aforesaid bar, a locking member for securing the micrometer engaging member in adjusted position, a stem secured to the micrometer and extended through the channeled portions of the base and upright shaft, and means for preventing the micrometer from turning while adjusting measurements, substantially as set forth.

FRANK A. NELIS.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

Patented May 21, 1918. y

Then adjust member 10 up or 

